Musk promises '10km Hyperloop tunnel' in 2020

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image copyrightAndreas Heddergott /TUM
image captionMr Musk's announcement follows the latest speed competition

Elon Musk says he wants a new 10km (six-mile) vacuum tunnel for his futuristic Hyperloop - ready for next year's speed-record competition.

Hyperloop aims to transport people in high-speed pods in underground tubes.

Mr Musk tweeted his plan after the Technical University of Munich set a new record for the fourth year running.

Its pod reached 463km/h (288mph) on the current test tube in the US, which runs for 1.6km straight. Mr Musk said the new vacuum tube would be curved.

The BBC is not responsible for the content of external sites.View original tweet on Twitter

Ultimately, Hyperloop trains will aim for a top speed of 1,220km/h (700mph).

The idea received investment from Richard Branson's Virgin group, which is developing a passenger system called Hyperloop One that it says will have a top speed of 1,080km/h (670mph).

image copyrightAFP
image captionNo pressure: The Munich team load their new pod

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